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<FONT color="green">001</FONT>    /*<a name="line.1"></a>
<FONT color="green">002</FONT>     * Licensed to the Apache Software Foundation (ASF) under one or more<a name="line.2"></a>
<FONT color="green">003</FONT>     * contributor license agreements.  See the NOTICE file distributed with<a name="line.3"></a>
<FONT color="green">004</FONT>     * this work for additional information regarding copyright ownership.<a name="line.4"></a>
<FONT color="green">005</FONT>     * The ASF licenses this file to You under the Apache License, Version 2.0<a name="line.5"></a>
<FONT color="green">006</FONT>     * (the "License"); you may not use this file except in compliance with<a name="line.6"></a>
<FONT color="green">007</FONT>     * the License.  You may obtain a copy of the License at<a name="line.7"></a>
<FONT color="green">008</FONT>     *<a name="line.8"></a>
<FONT color="green">009</FONT>     *     http://www.apache.org/licenses/LICENSE-2.0<a name="line.9"></a>
<FONT color="green">010</FONT>     *<a name="line.10"></a>
<FONT color="green">011</FONT>     * Unless required by applicable law or agreed to in writing, software<a name="line.11"></a>
<FONT color="green">012</FONT>     * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.12"></a>
<FONT color="green">013</FONT>     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.13"></a>
<FONT color="green">014</FONT>     * See the License for the specific language governing permissions and<a name="line.14"></a>
<FONT color="green">015</FONT>     * limitations under the License.<a name="line.15"></a>
<FONT color="green">016</FONT>     */<a name="line.16"></a>
<FONT color="green">017</FONT>    package org.apache.commons.jxpath;<a name="line.17"></a>
<FONT color="green">018</FONT>    <a name="line.18"></a>
<FONT color="green">019</FONT>    import java.io.BufferedReader;<a name="line.19"></a>
<FONT color="green">020</FONT>    import java.io.File;<a name="line.20"></a>
<FONT color="green">021</FONT>    import java.io.FileInputStream;<a name="line.21"></a>
<FONT color="green">022</FONT>    import java.io.IOException;<a name="line.22"></a>
<FONT color="green">023</FONT>    import java.io.InputStream;<a name="line.23"></a>
<FONT color="green">024</FONT>    import java.io.InputStreamReader;<a name="line.24"></a>
<FONT color="green">025</FONT>    import java.util.Properties;<a name="line.25"></a>
<FONT color="green">026</FONT>    <a name="line.26"></a>
<FONT color="green">027</FONT>    /**<a name="line.27"></a>
<FONT color="green">028</FONT>     * Defines a factory API that enables applications to obtain a<a name="line.28"></a>
<FONT color="green">029</FONT>     * {@link JXPathContext} instance.  To acquire a JXPathContext, first call the<a name="line.29"></a>
<FONT color="green">030</FONT>     * static {@link #newInstance} method of JXPathContextFactory.<a name="line.30"></a>
<FONT color="green">031</FONT>     * This method returns a concrete JXPathContextFactory.<a name="line.31"></a>
<FONT color="green">032</FONT>     * Then call {@link #newContext} on that instance.  You will rarely<a name="line.32"></a>
<FONT color="green">033</FONT>     * need to perform these steps explicitly: usually you can call one of the<a name="line.33"></a>
<FONT color="green">034</FONT>     * &lt;code&gt;JXPathContex.newContext&lt;/code&gt; methods, which will perform these steps<a name="line.34"></a>
<FONT color="green">035</FONT>     * for you.<a name="line.35"></a>
<FONT color="green">036</FONT>     *<a name="line.36"></a>
<FONT color="green">037</FONT>     * @see JXPathContext#newContext(Object)<a name="line.37"></a>
<FONT color="green">038</FONT>     * @see JXPathContext#newContext(JXPathContext,Object)<a name="line.38"></a>
<FONT color="green">039</FONT>     *<a name="line.39"></a>
<FONT color="green">040</FONT>     * @author Dmitri Plotnikov<a name="line.40"></a>
<FONT color="green">041</FONT>     * @version $Revision: 670727 $ $Date: 2008-06-23 15:10:38 -0500 (Mon, 23 Jun 2008) $<a name="line.41"></a>
<FONT color="green">042</FONT>     */<a name="line.42"></a>
<FONT color="green">043</FONT>    public abstract class JXPathContextFactory {<a name="line.43"></a>
<FONT color="green">044</FONT>    <a name="line.44"></a>
<FONT color="green">045</FONT>        /** The default property */<a name="line.45"></a>
<FONT color="green">046</FONT>        public static final String FACTORY_NAME_PROPERTY =<a name="line.46"></a>
<FONT color="green">047</FONT>            "org.apache.commons.jxpath.JXPathContextFactory";<a name="line.47"></a>
<FONT color="green">048</FONT>    <a name="line.48"></a>
<FONT color="green">049</FONT>        /** The default factory class */<a name="line.49"></a>
<FONT color="green">050</FONT>        private static final String DEFAULT_FACTORY_CLASS =<a name="line.50"></a>
<FONT color="green">051</FONT>            "org.apache.commons.jxpath.ri.JXPathContextFactoryReferenceImpl";<a name="line.51"></a>
<FONT color="green">052</FONT>    <a name="line.52"></a>
<FONT color="green">053</FONT>        /** Avoid reading all the files when the findFactory<a name="line.53"></a>
<FONT color="green">054</FONT>            method is called the second time ( cache the result of<a name="line.54"></a>
<FONT color="green">055</FONT>            finding the default impl )<a name="line.55"></a>
<FONT color="green">056</FONT>        */<a name="line.56"></a>
<FONT color="green">057</FONT>        private static String factoryImplName = null;<a name="line.57"></a>
<FONT color="green">058</FONT>    <a name="line.58"></a>
<FONT color="green">059</FONT>        /**<a name="line.59"></a>
<FONT color="green">060</FONT>         * Create a new JXPathContextFactory.<a name="line.60"></a>
<FONT color="green">061</FONT>         */<a name="line.61"></a>
<FONT color="green">062</FONT>        protected JXPathContextFactory () {<a name="line.62"></a>
<FONT color="green">063</FONT>    <a name="line.63"></a>
<FONT color="green">064</FONT>        }<a name="line.64"></a>
<FONT color="green">065</FONT>    <a name="line.65"></a>
<FONT color="green">066</FONT>        /**<a name="line.66"></a>
<FONT color="green">067</FONT>         * Obtain a new instance of a &lt;code&gt;JXPathContextFactory&lt;/code&gt;.<a name="line.67"></a>
<FONT color="green">068</FONT>         * This static method creates a new factory instance.<a name="line.68"></a>
<FONT color="green">069</FONT>         * This method uses the following ordered lookup procedure to determine<a name="line.69"></a>
<FONT color="green">070</FONT>         * the &lt;code&gt;JXPathContextFactory&lt;/code&gt; implementation class to load:<a name="line.70"></a>
<FONT color="green">071</FONT>         * &lt;ul&gt;<a name="line.71"></a>
<FONT color="green">072</FONT>         * &lt;li&gt;<a name="line.72"></a>
<FONT color="green">073</FONT>         * Use  the &lt;code&gt;org.apache.commons.jxpath.JXPathContextFactory&lt;/code&gt;<a name="line.73"></a>
<FONT color="green">074</FONT>         * system property.<a name="line.74"></a>
<FONT color="green">075</FONT>         * &lt;/li&gt;<a name="line.75"></a>
<FONT color="green">076</FONT>         * &lt;li&gt;<a name="line.76"></a>
<FONT color="green">077</FONT>         * Alternatively, use the JAVA_HOME (the parent directory where jdk is<a name="line.77"></a>
<FONT color="green">078</FONT>         * installed)/lib/jxpath.properties for a property file that contains the<a name="line.78"></a>
<FONT color="green">079</FONT>         * name of the implementation class keyed on<a name="line.79"></a>
<FONT color="green">080</FONT>         * &lt;code&gt;org.apache.commons.jxpath.JXPathContextFactory&lt;/code&gt;.<a name="line.80"></a>
<FONT color="green">081</FONT>         * &lt;/li&gt;<a name="line.81"></a>
<FONT color="green">082</FONT>         * &lt;li&gt;<a name="line.82"></a>
<FONT color="green">083</FONT>         * Use the Services API (as detailed in the JAR specification), if<a name="line.83"></a>
<FONT color="green">084</FONT>         * available, to determine the classname. The Services API will look<a name="line.84"></a>
<FONT color="green">085</FONT>         * for a classname in the file<a name="line.85"></a>
<FONT color="green">086</FONT>         * &lt;code&gt;META- INF/services/&lt;i&gt;org.apache.commons.jxpath.<a name="line.86"></a>
<FONT color="green">087</FONT>         * JXPathContextFactory&lt;/i&gt;&lt;/code&gt; in jars available to the runtime.<a name="line.87"></a>
<FONT color="green">088</FONT>         * &lt;/li&gt;<a name="line.88"></a>
<FONT color="green">089</FONT>         * &lt;li&gt;<a name="line.89"></a>
<FONT color="green">090</FONT>         * Platform default &lt;code&gt;JXPathContextFactory&lt;/code&gt; instance.<a name="line.90"></a>
<FONT color="green">091</FONT>         * &lt;/li&gt;<a name="line.91"></a>
<FONT color="green">092</FONT>         * &lt;/ul&gt;<a name="line.92"></a>
<FONT color="green">093</FONT>         *<a name="line.93"></a>
<FONT color="green">094</FONT>         * Once an application has obtained a reference to a<a name="line.94"></a>
<FONT color="green">095</FONT>         * &lt;code&gt;JXPathContextFactory&lt;/code&gt; it can use the factory to<a name="line.95"></a>
<FONT color="green">096</FONT>         * obtain JXPathContext instances.<a name="line.96"></a>
<FONT color="green">097</FONT>         *<a name="line.97"></a>
<FONT color="green">098</FONT>         * @return JXPathContextFactory<a name="line.98"></a>
<FONT color="green">099</FONT>         * @exception JXPathContextFactoryConfigurationError if the implementation<a name="line.99"></a>
<FONT color="green">100</FONT>         *            is not available or cannot be instantiated.<a name="line.100"></a>
<FONT color="green">101</FONT>         */<a name="line.101"></a>
<FONT color="green">102</FONT>        public static JXPathContextFactory newInstance() {<a name="line.102"></a>
<FONT color="green">103</FONT>            if (factoryImplName == null) {<a name="line.103"></a>
<FONT color="green">104</FONT>                factoryImplName =<a name="line.104"></a>
<FONT color="green">105</FONT>                    findFactory(FACTORY_NAME_PROPERTY, DEFAULT_FACTORY_CLASS);<a name="line.105"></a>
<FONT color="green">106</FONT>            }<a name="line.106"></a>
<FONT color="green">107</FONT>    <a name="line.107"></a>
<FONT color="green">108</FONT>            JXPathContextFactory factoryImpl;<a name="line.108"></a>
<FONT color="green">109</FONT>            try {<a name="line.109"></a>
<FONT color="green">110</FONT>                Class clazz = Class.forName(factoryImplName);<a name="line.110"></a>
<FONT color="green">111</FONT>                factoryImpl = (JXPathContextFactory) clazz.newInstance();<a name="line.111"></a>
<FONT color="green">112</FONT>            }<a name="line.112"></a>
<FONT color="green">113</FONT>            catch (ClassNotFoundException cnfe) {<a name="line.113"></a>
<FONT color="green">114</FONT>                throw new JXPathContextFactoryConfigurationError(cnfe);<a name="line.114"></a>
<FONT color="green">115</FONT>            }<a name="line.115"></a>
<FONT color="green">116</FONT>            catch (IllegalAccessException iae) {<a name="line.116"></a>
<FONT color="green">117</FONT>                throw new JXPathContextFactoryConfigurationError(iae);<a name="line.117"></a>
<FONT color="green">118</FONT>            }<a name="line.118"></a>
<FONT color="green">119</FONT>            catch (InstantiationException ie) {<a name="line.119"></a>
<FONT color="green">120</FONT>                throw new JXPathContextFactoryConfigurationError(ie);<a name="line.120"></a>
<FONT color="green">121</FONT>            }<a name="line.121"></a>
<FONT color="green">122</FONT>            return factoryImpl;<a name="line.122"></a>
<FONT color="green">123</FONT>        }<a name="line.123"></a>
<FONT color="green">124</FONT>    <a name="line.124"></a>
<FONT color="green">125</FONT>        /**<a name="line.125"></a>
<FONT color="green">126</FONT>         * Creates a new instance of a JXPathContext using the<a name="line.126"></a>
<FONT color="green">127</FONT>         * currently configured parameters.<a name="line.127"></a>
<FONT color="green">128</FONT>         * @param parentContext parent context<a name="line.128"></a>
<FONT color="green">129</FONT>         * @param contextBean Object bean<a name="line.129"></a>
<FONT color="green">130</FONT>         * @return JXPathContext<a name="line.130"></a>
<FONT color="green">131</FONT>         * @exception JXPathContextFactoryConfigurationError if a JXPathContext<a name="line.131"></a>
<FONT color="green">132</FONT>         *            cannot be created which satisfies the configuration requested<a name="line.132"></a>
<FONT color="green">133</FONT>         */<a name="line.133"></a>
<FONT color="green">134</FONT>    <a name="line.134"></a>
<FONT color="green">135</FONT>        public abstract JXPathContext newContext(<a name="line.135"></a>
<FONT color="green">136</FONT>            JXPathContext parentContext,<a name="line.136"></a>
<FONT color="green">137</FONT>            Object contextBean);<a name="line.137"></a>
<FONT color="green">138</FONT>    <a name="line.138"></a>
<FONT color="green">139</FONT>        // -------------------- private methods --------------------<a name="line.139"></a>
<FONT color="green">140</FONT>        // This code is duplicated in all factories.<a name="line.140"></a>
<FONT color="green">141</FONT>        // Keep it in sync or move it to a common place<a name="line.141"></a>
<FONT color="green">142</FONT>        // Because it's small probably it's easier to keep it here<a name="line.142"></a>
<FONT color="green">143</FONT>    <a name="line.143"></a>
<FONT color="green">144</FONT>        /** Temp debug code - this will be removed after we test everything<a name="line.144"></a>
<FONT color="green">145</FONT>         */<a name="line.145"></a>
<FONT color="green">146</FONT>        private static boolean debug = false;<a name="line.146"></a>
<FONT color="green">147</FONT>        static {<a name="line.147"></a>
<FONT color="green">148</FONT>            try {<a name="line.148"></a>
<FONT color="green">149</FONT>                debug = System.getProperty("jxpath.debug") != null;<a name="line.149"></a>
<FONT color="green">150</FONT>            }<a name="line.150"></a>
<FONT color="green">151</FONT>            catch (SecurityException se) { //NOPMD<a name="line.151"></a>
<FONT color="green">152</FONT>                // This is ok<a name="line.152"></a>
<FONT color="green">153</FONT>            }<a name="line.153"></a>
<FONT color="green">154</FONT>        }<a name="line.154"></a>
<FONT color="green">155</FONT>    <a name="line.155"></a>
<FONT color="green">156</FONT>        /**<a name="line.156"></a>
<FONT color="green">157</FONT>         * Private implementation method - will find the implementation<a name="line.157"></a>
<FONT color="green">158</FONT>         * class in the specified order.<a name="line.158"></a>
<FONT color="green">159</FONT>         * @param property    Property name<a name="line.159"></a>
<FONT color="green">160</FONT>         * @param defaultFactory Default implementation, if nothing else is found<a name="line.160"></a>
<FONT color="green">161</FONT>         *<a name="line.161"></a>
<FONT color="green">162</FONT>         * @return class name of the JXPathContextFactory<a name="line.162"></a>
<FONT color="green">163</FONT>         */<a name="line.163"></a>
<FONT color="green">164</FONT>        private static String findFactory(String property, String defaultFactory) {<a name="line.164"></a>
<FONT color="green">165</FONT>            // Use the factory ID system property first<a name="line.165"></a>
<FONT color="green">166</FONT>            try {<a name="line.166"></a>
<FONT color="green">167</FONT>                String systemProp = System.getProperty(property);<a name="line.167"></a>
<FONT color="green">168</FONT>                if (systemProp != null) {<a name="line.168"></a>
<FONT color="green">169</FONT>                    if (debug) {<a name="line.169"></a>
<FONT color="green">170</FONT>                        System.err.println(<a name="line.170"></a>
<FONT color="green">171</FONT>                            "JXPath: found system property" + systemProp);<a name="line.171"></a>
<FONT color="green">172</FONT>                    }<a name="line.172"></a>
<FONT color="green">173</FONT>                    return systemProp;<a name="line.173"></a>
<FONT color="green">174</FONT>                }<a name="line.174"></a>
<FONT color="green">175</FONT>    <a name="line.175"></a>
<FONT color="green">176</FONT>            }<a name="line.176"></a>
<FONT color="green">177</FONT>            catch (SecurityException se) { //NOPMD<a name="line.177"></a>
<FONT color="green">178</FONT>                // Ignore<a name="line.178"></a>
<FONT color="green">179</FONT>           }<a name="line.179"></a>
<FONT color="green">180</FONT>    <a name="line.180"></a>
<FONT color="green">181</FONT>            // try to read from $java.home/lib/xml.properties<a name="line.181"></a>
<FONT color="green">182</FONT>            try {<a name="line.182"></a>
<FONT color="green">183</FONT>                String javah = System.getProperty("java.home");<a name="line.183"></a>
<FONT color="green">184</FONT>                String configFile =<a name="line.184"></a>
<FONT color="green">185</FONT>                    javah<a name="line.185"></a>
<FONT color="green">186</FONT>                        + File.separator<a name="line.186"></a>
<FONT color="green">187</FONT>                        + "lib"<a name="line.187"></a>
<FONT color="green">188</FONT>                        + File.separator<a name="line.188"></a>
<FONT color="green">189</FONT>                        + "jxpath.properties";<a name="line.189"></a>
<FONT color="green">190</FONT>                File f = new File(configFile);<a name="line.190"></a>
<FONT color="green">191</FONT>                if (f.exists()) {<a name="line.191"></a>
<FONT color="green">192</FONT>                    Properties props = new Properties();<a name="line.192"></a>
<FONT color="green">193</FONT>                    FileInputStream fis = new FileInputStream(f);<a name="line.193"></a>
<FONT color="green">194</FONT>                    try {<a name="line.194"></a>
<FONT color="green">195</FONT>                        props.load(fis);<a name="line.195"></a>
<FONT color="green">196</FONT>                    }<a name="line.196"></a>
<FONT color="green">197</FONT>                    finally {<a name="line.197"></a>
<FONT color="green">198</FONT>                        if (fis != null) {<a name="line.198"></a>
<FONT color="green">199</FONT>                            try {<a name="line.199"></a>
<FONT color="green">200</FONT>                                fis.close();<a name="line.200"></a>
<FONT color="green">201</FONT>                            }<a name="line.201"></a>
<FONT color="green">202</FONT>                            catch (IOException e) { //NOPMD<a name="line.202"></a>
<FONT color="green">203</FONT>                                //swallow<a name="line.203"></a>
<FONT color="green">204</FONT>                            }<a name="line.204"></a>
<FONT color="green">205</FONT>                        }<a name="line.205"></a>
<FONT color="green">206</FONT>                    }<a name="line.206"></a>
<FONT color="green">207</FONT>                    String factory = props.getProperty(property);<a name="line.207"></a>
<FONT color="green">208</FONT>                    if (factory != null) {<a name="line.208"></a>
<FONT color="green">209</FONT>                        if (debug) {<a name="line.209"></a>
<FONT color="green">210</FONT>                            System.err.println(<a name="line.210"></a>
<FONT color="green">211</FONT>                                "JXPath: found java.home property " + factory);<a name="line.211"></a>
<FONT color="green">212</FONT>                        }<a name="line.212"></a>
<FONT color="green">213</FONT>                        return factory;<a name="line.213"></a>
<FONT color="green">214</FONT>                    }<a name="line.214"></a>
<FONT color="green">215</FONT>                }<a name="line.215"></a>
<FONT color="green">216</FONT>            }<a name="line.216"></a>
<FONT color="green">217</FONT>            catch (IOException ex) {<a name="line.217"></a>
<FONT color="green">218</FONT>                if (debug) {<a name="line.218"></a>
<FONT color="green">219</FONT>                    ex.printStackTrace();<a name="line.219"></a>
<FONT color="green">220</FONT>                }<a name="line.220"></a>
<FONT color="green">221</FONT>            }<a name="line.221"></a>
<FONT color="green">222</FONT>    <a name="line.222"></a>
<FONT color="green">223</FONT>            String serviceId = "META-INF/services/" + property;<a name="line.223"></a>
<FONT color="green">224</FONT>            // try to find services in CLASSPATH<a name="line.224"></a>
<FONT color="green">225</FONT>            try {<a name="line.225"></a>
<FONT color="green">226</FONT>                ClassLoader cl = JXPathContextFactory.class.getClassLoader();<a name="line.226"></a>
<FONT color="green">227</FONT>                InputStream is = null;<a name="line.227"></a>
<FONT color="green">228</FONT>                if (cl == null) {<a name="line.228"></a>
<FONT color="green">229</FONT>                    is = ClassLoader.getSystemResourceAsStream(serviceId);<a name="line.229"></a>
<FONT color="green">230</FONT>                }<a name="line.230"></a>
<FONT color="green">231</FONT>                else {<a name="line.231"></a>
<FONT color="green">232</FONT>                    is = cl.getResourceAsStream(serviceId);<a name="line.232"></a>
<FONT color="green">233</FONT>                }<a name="line.233"></a>
<FONT color="green">234</FONT>    <a name="line.234"></a>
<FONT color="green">235</FONT>                if (is != null) {<a name="line.235"></a>
<FONT color="green">236</FONT>                    if (debug) {<a name="line.236"></a>
<FONT color="green">237</FONT>                        System.err.println("JXPath: found  " + serviceId);<a name="line.237"></a>
<FONT color="green">238</FONT>                    }<a name="line.238"></a>
<FONT color="green">239</FONT>                    BufferedReader rd =<a name="line.239"></a>
<FONT color="green">240</FONT>                        new BufferedReader(new InputStreamReader(is));<a name="line.240"></a>
<FONT color="green">241</FONT>    <a name="line.241"></a>
<FONT color="green">242</FONT>                    String factory = null;<a name="line.242"></a>
<FONT color="green">243</FONT>                    try {<a name="line.243"></a>
<FONT color="green">244</FONT>                        factory = rd.readLine();<a name="line.244"></a>
<FONT color="green">245</FONT>                    }<a name="line.245"></a>
<FONT color="green">246</FONT>                    finally {<a name="line.246"></a>
<FONT color="green">247</FONT>                        try {<a name="line.247"></a>
<FONT color="green">248</FONT>                            rd.close();<a name="line.248"></a>
<FONT color="green">249</FONT>                        }<a name="line.249"></a>
<FONT color="green">250</FONT>                        catch (IOException e) { //NOPMD<a name="line.250"></a>
<FONT color="green">251</FONT>                            //swallow<a name="line.251"></a>
<FONT color="green">252</FONT>                        }<a name="line.252"></a>
<FONT color="green">253</FONT>                    }<a name="line.253"></a>
<FONT color="green">254</FONT>    <a name="line.254"></a>
<FONT color="green">255</FONT>                    if (factory != null &amp;&amp; !"".equals(factory)) {<a name="line.255"></a>
<FONT color="green">256</FONT>                        if (debug) {<a name="line.256"></a>
<FONT color="green">257</FONT>                            System.err.println(<a name="line.257"></a>
<FONT color="green">258</FONT>                                "JXPath: loaded from services: " + factory);<a name="line.258"></a>
<FONT color="green">259</FONT>                        }<a name="line.259"></a>
<FONT color="green">260</FONT>                        return factory;<a name="line.260"></a>
<FONT color="green">261</FONT>                    }<a name="line.261"></a>
<FONT color="green">262</FONT>                }<a name="line.262"></a>
<FONT color="green">263</FONT>            }<a name="line.263"></a>
<FONT color="green">264</FONT>            catch (Exception ex) {<a name="line.264"></a>
<FONT color="green">265</FONT>                if (debug) {<a name="line.265"></a>
<FONT color="green">266</FONT>                    ex.printStackTrace();<a name="line.266"></a>
<FONT color="green">267</FONT>                }<a name="line.267"></a>
<FONT color="green">268</FONT>            }<a name="line.268"></a>
<FONT color="green">269</FONT>            return defaultFactory;<a name="line.269"></a>
<FONT color="green">270</FONT>        }<a name="line.270"></a>
<FONT color="green">271</FONT>    }<a name="line.271"></a>




























































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